netdev - Re: [RFC PATCH net-next 3/3] virtio-net: Add accelerated RFS support

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Date:	Thu, 16 Jan 2014 21:31:27 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Zhi Yong Wu <zwu.kernel@...il.com>
CC:	<netdev@...r.kernel.org>, <therbert@...gle.com>,
	<edumazet@...gle.com>, <davem@...emloft.net>,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH net-next 3/3] virtio-net: Add accelerated RFS support

On Wed, 2014-01-15 at 22:20 +0800, Zhi Yong Wu wrote:
[...]
> +static int virtnet_init_rx_cpu_rmap(struct virtnet_info *vi)
> +{
> +	int rc = 0;
> +
> +#ifdef CONFIG_RFS_ACCEL
> +	struct virtio_device *vdev = vi->vdev;
> +	unsigned int irq;
> +	int i;
> +
> +	if (!vi->affinity_hint_set)
> +		goto out;
> +
> +	vi->dev->rx_cpu_rmap = alloc_irq_cpu_rmap(vi->max_queue_pairs);
> +	if (!vi->dev->rx_cpu_rmap) {
> +		rc = -ENOMEM;
> +		goto out;
> +	}
> +
> +	for (i = 0; i < vi->max_queue_pairs; i++) {
> +		irq = virtqueue_get_vq_irq(vdev, vi->rq[i].vq);
> +		if (irq == -1)
> +			goto failed;

Jumping into an if-statement is confusing.  Also do you really want to
return 0 in this case?

Otherwise this looks fine.

Ben.

> +		rc = irq_cpu_rmap_add(vi->dev->rx_cpu_rmap, irq);
> +		if (rc) {
> +failed:
> +			virtnet_free_irq_cpu_rmap(vi);
> +			goto out;
> +		}
> +	}
> +out:
> +#endif
> +	return rc;
> +}
[...]

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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